Grease gun



May 18 1926. 1,584,863

w. s. JOSEPHSON GREASE GUN I Filed Jan. 28. 1924 a! a l? am IWiiferkfasepfisafi Patented May 18, 1926.

I WALTER s. JosErnsoN,

mus, 'ro. Darren ooarorwrron ronarron or DELAWARE.

WRIIENIWOFFICE.

OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESINE ASSIGN- 0 F AMERICA, 0]? NEWYORK,

N. Y., .6. C03- GBEASE GUN.

Application filed .Tanuary 2a, 1924. Serial No. 688,001.

The...ob3'ect of my invention is to provide certain improvements in thegrease gun disclosed in my application Serial 681,204, filed December17, 1923, whereby to provide c an easy means of-filling the grease gunwithout the necessity of soiling the hands or clothing of the operatorwith grease as occurs with nearl every type of grease gun now in use; an'for the further object of provid- 10 ing an easy means for returningthe piston to its starting position.

I attain these and other objects of my invention by the mechanismillustrated in the accompan ing drawing, in which the figure II is anaxia sectional view of the device.

Referring to the drawing, there is illustrated a form of invention inwhich the cylinder 31, of uniform diameter throughout its length, isprovided with a Q single piston 32 and dividing the cylinder intochambers 3 and 4. I provide a coil spring in chamber 3, which isattached at one end to an eye member 34 attached to the piston 32, andat the other end to an eye 26 member 36, which is attached to the end ofc linder 31 farthest from its cap 6 and discharge opening 7 The coilsprin 35 is attached at its ends to the eyes 34 an 36. A bottle ofcompresed gas can be attached to It! the threaded end 18 of inletpipe17. I provide suitable stops 33 to travel of piston 32. Stops 33have a function e uivalent to'stop lug 12 of the other form 0% myinvention.

limit the range of The filling is accomplished by the creation of avacuum in the grease compartment 4 through the forcing up of the pistonwhich is accomplished by the coil spring 35.

In the event that heavy grease is to be used, the cap 6 at the end ofthe grease chamber 4 may be removed so as to offer ample spacefortheinflow ofthe lubricant.

In order that the grease compartment 4, may be completely filled, thegrease piston is permitted to travel-higher than the grease line orlevel desired in the gun, as it is evident that a perfect vacuum willnot be secured and an allowance is thus made to compensate for theimperfect vacuum.

The film of grease always on the walls of grease chambers 4 promotes theseal between the piston cup leathers or rings, as the case maybe, andthe cylinder walls, insuring smooth operation of the device under allconditions as it fills minute irregularities in {lhe rim of the pistonor grease chamber we What I claim is:

In a grease gun, inder, a piston, means for the inflow of fluid pressureto the cylinder chamber behind the piston, a spring attached to'thepiston and to the end of the cylinder to normally withdraw the piston toa retracted position, and a removable conical discharge nozzle formingthe end of the cylinder.

WALTER s. JOSEPHSON.

the combination of a cyl-

